Spark-plug.



w. s. WITTBR.

SPARK PLUG.

APPLIOATION FILED MAY 26, 1913.

ZMUR. m mm 1 45 6 M 5 85 2 EW 5 a W S. v w w d v v m 7 m a t 44 m 02$ 99 A w 5 Q V 9 MM M m; A 1 was? WILLIAM S. WITTER, OF TOLEDO, IOWA.

SiPARK-PLUG.

Specification of Letters Patent.

Patented J uly 21, 1914.

Application filed May 26, 1913. Serial No 789,991.

To all whom it may concern:

Be it known that I, WILLIAM S. VVITTER, a citizen of the United States, residing at Toledo, in the county of Tama and State of Iowa, have invented certain new and useful IIn rovements in Spark-Plugs, of which the fol owing is a speclfication, reference being had to the accompanying drawings.

This invention relates to new and useful improvements in spark plugs and more particularly to an improvement on my allowed application for a spark plug, filed November 20, 1911, Serial No. 661,250, and the primary object of the invention is to provide a spark plug which will permit two sparks to occur in rapid succession at each operation g of the same.

In addition. to the numerous objects set forth in -my allowed application above referred to, a still further object resides in providing. a plug provided with means whereby the engine may be primed therefrom and a still further object resides in providing an improved insulating means in connection with the plug.

Still another object of the invention re sides in providing a device which is simple and durable in construction, inexpensive to manufacture and one which will be very efficient and useful in operation.

Vith these and other objects in view, the invention consists in the novel features ofconstruction, combination and arrangement of Parts as will be hereinafter referred to and more particularly pointed out in the specification and claims.

In the accompanying drawing forming a part of this application, "Figure 1 is a side elevation of my improved plug. Fig. 2 is a vertical section theretlirough. laig. is a horizontal section through the same. Fig. 4 is a bottom plan view of the plug. Fig. 5 is a detail perspective view of the intermediate electrode removed; and Fig. 6 is a fragmentary side elevation of the plug showing the terminal nut efi'ectivcly applied in its reverse position in connection with a slightly different form of Wire terminal.

In describing my invention, Iv shall refer to the drawing in which similar reference. characters designate corresponding parts throughout the several views and in which 1 indicates a shell which ,has the lower portion thereof threaded externally, as shown at 2, the upper portion of the same the aforesaid washers.

being threaded internally as shown at 3 and der of an engine.

Disposed through the shell 1, is an electrode bolt 7, the head 8 of which is disposed below the lower end of the shell and applied to said bolt toextend for'the greater portion of the length thereof and resting on the head 8, is a mica insulating tube 9. En circling said tube and resting on the'head 8,

of the bolt 7, is an insulating sleeve formed of a plurality of mica washers 10, arranged one upon the other and engaged with the internally threaded portion 3 of the shell 1, to fit tightly about the tube 9, is a gland nut 11, the lower end of the latter eng." 'ing the upper edge of the insulating sleeve formed on Also encircling the tube 9 to rest upon the upper face "of the gland nut 11, is a mica-washer 12, which forms a cushion or the like for a porcelain body member 13 which also applied to the upper portion of the bolt 7. The bore of this porcelain body 13 fits snugly around the shank of the bolt 7 and the same is counterbored from its lower end, as shown 'at 1 1, to snugly receive the upper portion of the tube 9 therein.

The upper end of the electrode bolt 7 rojects a short distance above the porce ain body 13'and is threaded, as shown at 15 to receive in engagement therewith a lock nut 16 and a terminal nut 17. Applied to the bolt 7, previous to the application of the nut 16 thereon, is a spring washer 18 which is received in a counter-b0red portion 19 in the upper end of the porcelain body 13, and when the aforesaid nut 16 is turned home on the bolt, a portion ofv the same will be also received in said counter-bored portion 19 and the binding contact thereof with the spring washer 18 will secure the part-srefer-red to together and lock the same against casual disengagement. The-bead formed on the porcelain body 13 through the formation of the counter-bore at the upper end thereof,

iii

shields the lock nut 16 and washer 18. Jill.

terminal 20 ct a wire is adapted to be ap phed to the projecting end of the stem or olt 7 to rest on the nut 16 below the nut 17. This terminal is loosely applied on the stem or bolt and receives in the bore thereof the tubular or sleeve-like portion 22 of said terminal nut 17, as clearly shown in Fig. 2 of the drawing. This tubular or sleeve-like portion continues'from an enlarged portion formed on the nut, said enlarged portion being providedmith an annular groove 21 which is designed for the purpose of receiving therein a different form of wire terminal (not shown.)

In Fig. 6, I have shown a fragmentary Y side elevation of the device with the terminal nut 17 reversed and applied to secure a slightly different form of wire-terminal 22 in position on the stem or bolt '7 between said nuts 16 and 17. In this position, it will be observed that the tubular or sleevelike portion 22 thereof is disposed so as to be on the top of the nut and, as stated above, a still further terminal (not shown) may be used in connection with the groove 21 of said terminalnu t.

Mounted in the head 8 of the electrode bolt 7, and projecting substantially later ally therefrom, 1s a stud forming an electrode 23 and mounted in the lower portion of the shell 1, to project downwardly therefrom, into the gap or cut-away portion 5 of the projection 4:, is an additional electrode 24. The lower end of theelectrode 24 is disposed to one side and above the free end of the electrode 23 and I have provided an intermediate electrode 25 to cooperate with said electrodes-P23 and 24. This electrode 25 consists of a plate-like member which is formed on an annular member 26, the latter encircling the insulating tube 9 and arran ed between certain of the mica washers 10, adjacent the head 8. This plate-lilre portion of the intermediate electrode 25 has an arcuate lower edge, as shown at 27 terminating in the points 28 and 29, the latter being disposed in a lane above the former. These points 28 one 29 are disposed respectively adjacent the free ends of the electrodes 23 andf2-l, to coiiperate with the latter.

The core portion of this plug is slightly spaced from the inner periphery of the shell .1, as clearly shown in Fig. 2 of the drawing and at the formation of the projection d on the shell 1, ,the latter is slightly counterbored, asshown at 30. It might here be stated that this. substantially annular projection l protectsthe insulation of the plug, when the latter is used in certain engines,

which overheat the plug to a 'considerable dc ee.

*ormed in the shell 1, adjacent its upper end, is a transverse threaded channel 31, which communicates, through the medium of that the lower end thereof projects entirely across the bore of the pro ection, nothing v which is introduced through the funnel will be fed to the bore of the shell. .When this funnel-like member, however, is turned so that the lower end is raised somewhat, gasole'ne may be introduced therein to flow through the projection into the bore of the shell, to the cylinder of the engine. Thus, this portion of the device forms a primin means for the engine and the u per end o the funnel-like valve 35 is k-nur ed so as to be readily operated by the hand.

From the foregoing-i. description of the construction of my improveddevice, the operation thereof will" be readily understood and it will be seen that I have provided an improved spark plug which is simple and durable in construction, inexpensive to manufacture and one which will be very efficient and useful in operation.

WhileI have particularly described the elements best adapted to perform the functions set forth, it is obvious that various changes in form, proportion and in the minor details of construction may be resorted to without departing from the s irit ,ing the upper portion thereof internally threaded, a nut engaged with the threaded portion of said shell, a stem disposed through said shell and nut and having a head thereon at its lower end disposed below the lower end of said shell, an insulating means applied to said stem to rest on said head and having a portionthereof disposed throiigh said nut, a insulatin body applied to said stcmfto rest on t cunt and having a portion of said insulating means disposed t erethrough, means in connection with said. body and the upper end of said nut to clamp the insulating parts of the plug together, an electrode carried on the head of said stem, an additional electrode carried on the lower end of said shell and depending there-from, an intermediate ele'ctrode carried on said insulating means ad-' jacent the lower end of said stem and provided with points disposed respectively adjacent the aforesaid electrodes, and an arcuate flame protecting flangeformed on the arts of the plug together,

lower edge of the shell, said flange being provided with a gap receiving the additional electrode therethrough.

2. A spark plug consisting of a shell, the

inner wall of which is threaded at its upper end, a nut engaged with the threaded porof said tube to also rest on the head of said stem, the upper portion of said insulating sleeve engaging the lower edge of said nut, an insulating body applied on said nut and receiving said stem and a portion of said insulating tube therethrough, means in connection with the upper end of said stem and.

said body to clamp the insulating parts of the plug together, an electrode carried on the head of said stem and extending laterally therefrom, an additional electrode carried on said shell and depending therefrom, an intermediate electrode carried on the insulating sleeve and having a pair of points thereon respectively disposed in close proximity to the aforesaid electrodes, and a depending annular flange formed on the lower edge of said shell, said flange being pro vided with a gap therein to receive the additional electrode therethrough.

3. In a spark plug, a shell having an internally threaded portion at the upper end thereof, a tubular nut engaged with the threaded portion of said shell, said nut bemg provided with a bead on the upper end thereof to extend above the upper end of the shell, said bead beingflattened at diametrically opposite points thereon, a stem extending'through the shell and nut, said stem being provided with a head on the lower end disposed below the lower end of said shell, an insulating tube applied on the stem to rest on-the hcad thereon and extending through said nut, an insulating sleeve surrounding the lower portion of said tube and contacting at its ends respectively with said head and the lower end of said nut, an insulating body applied on the upper portion or" the same above the nut and receiving a portion of said tube therein, a cushion washer encircling said tube between said body and said nut, means engaged with the upper end of said stem and the upper portion of said body to clamp the insulating irovided with a recess at the upper portion hereof to receive the last mentioned means therein, an electrode carried on the head of said stem, an additional electrode depending jecting below the lower end a portion of said tube therein, a

Washer disposed between said body and nut,

from said ring member,

said body being fromr-the lower end of said shell, and an intermediate electrode carried on the insulating sleeve and having a pair of points thereon respectively disposed in close proximity to the aforesaid electrodes.

4;. In a spark plug, a shell having an internally threaded portion at the upper end thereof, a tubular nut engaged therewith having a bead on the upper end to project above the top of said shell, a stem disposed through" said shell and nut to project some distance above the latter, said stem being provided with a head on its lower end proof said shell, an insulating tube applied on said stem to reston the head thereof and extending through said nut, a plurality of insulating washer members encircling said tube between the head on said stem and the lower end of said nut, an insulating body applied on the upper end of said stem above the nut and receiving cushion the upper end of said body being provided with a recess,a washer applled on the upper end of said stem and disposed within said recess, a locknut applied on said stem above the w'asher'to clamp the insulating parts of the plug together, said nut being partially rece1ved in the recess of said body, a reversible terminal nut applied to said stem above the lock nut, an electrode carried on the head of said stem, an additional electrode depending from the lower end of said shell, a ring member clamped between certain of the insulating washer members, and an interme diate electrode formed, on and depending said intermediate electrode being provided with a pair of pointsdisposed in close proximity respectively to the aforesaid electrodes.

, 5. A spark plug consisting of a shell, a nut removabl'y engaged with the upper end thereof, astem extending through said shell and nut, insulating means between the stem and nut, an insulating body applied to the I upper end of said stem, means to clamp the insulating parts of the device together, an electrode carried on the lower end of said stem, an additional electrode carried on the lower end of said shell, an intermediate electrode carried on the aforesaid insulating means, and a flame protecting flange formed on the lower edge of the shell and provided a gap to receive said additional elecwith trode therethrough.

. In testimony whereof I hereunto afiixtiny signature in the presence of two witnesses;

l/VILLIAM S. WITTER.

lVitnesses D. E. BROWN, Rom. Rnnon. 

